Ciba Specialty Chemicals Corporation

Ciba-Geigy Corporation

Basf Se Corporation

Sankyo Company, Limited

François Gugumus

Jean Rody

David G Leppard

Michela Bonora

Michael Rasberger

Giuseppe Cantatore

Erfinders G Cantatore

A synergistic stabilizer mixture comprising a component a) and, for example, a component b), where component a) is at least one compound of the formula I in which Ris hydrogen or methyl, Ris a direct bond or C-Calkylene, and nis a number from 2 to 50; component b) is at least one compound of the formulae IIa and IIb in which nand n* are a number from 2 to 50.

Synergistic stabilizer mixture

A stabilizer mixture containing the components (A) and (B) wherein  

Stabilizer mixtures

A stabilizer mixture containing the components (A), (B) and (C) wherein wherein 

A stabilizer mixture containing the components (I), (II) and (III) wherein component (I) is for example a compound of the formula (B-1-b) wherein Eis hydrogen;component (II) is for example a compound of the formula (B-0-a) wherein E* is hydrogen; andcomponent (III) is for example a compound of the formula (C-1-a) wherein bis a number from 2 to 20 and Ris hydrogen;is useful for stabilizing an organic material against degradation induced by light, heat or oxidation.

The novel transparent polyolefin, polyester or polyamide article disclosed is stabilized against the effects of light, oxygen, heat and agressive chemicals by addition of 0.005-0.30% by weight the polymeric substrate of a hydroxyphenyl triazine UV absorber, and is characterized by its thickness between 1 and 500 &#x3bc;m. Preferred polyolefin articles thus stabilized are agricultural films containing as further stabilizer a sterically hindered amine. The novel compositions act as selective UV filter especially useful in agriculture.

Transparent polymer articles of low thickness

Stabilizer mixture

The novel transparent polyolefin, polyester or polyamide article disclosed is stabilized against the effects of light, oxygen, heat and agressive chemicals by addition of 0.005&#x2013;0.30% by weight the polymeric substrate of a hydroxyphenyl triazine UV absorber, and is characterized by its thickness between 1 and 500 &#x3bc;m. Preferred polyolefin articles thus stabilized are agricultural films containing as further stabilizer a sterically hindered amine. The novel compositions act as selective UV filter especially useful in agriculture.

A stabilizer mixture containing A) either (A1) at least one compound of the formulain which Ris for example hydrogen or C&#x2013;Calkyl; R, R, Rand Rare for example hydrogen, C&#x2013;Calkyl or phenyl; Ris for example C&#x2013;Calkyl or 2,2,6,6-tetramethyl-4-piperidyl; and nis a number from 1 to 50; or (A2) at least one compound of the formulaewherein nand n* are a number from 2 to 50; Such a stabilizer mixture is particularly useful for stabilizing a polyolefin against light-induced degradation.

A stabilizer mixture containing Such a stabilizer mixture is particularly useful for stabilizing a polyolefin against light-induced degradation.

The present invention relates to polyolefin compositions which comprise as UV absorber a synergistic mixture of

Synergistic mixtures of UV-absorbers in polyolefins

The instant invention relates to a polyolefin composition which comprises

Synergistic combinations of UV absorbers for pigmented polyolefins

A stabilizer mixture containing (A) a sterically hindered amine compound, and (B) a polymer containing polar residues, the weight ratio of components (A) (B) being 20:1 to 1:20, with the provisos that, (1) component (B) is different from component (A) and does not contain groups of formulae (I) or (II) in which G is hydrogen or methyl, and Gand G, independently of one another, are hydrogen, methyl or together are a substituent &#x2550;O; and (2) component (B) is different from a polymer having an acidic hydrogen atom.

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Allschwil, Switzerland

François Gugumus